Attachment for drawing-boards.



A. J. 'BEGHTOLM JR. ATTACHMENT FOR DRAWING BOARDS. APPLIATIDN FILED JULY3 1, 1907.

9O,604. Patented'ne. 15, 1908..

(l. Q50. l

oN. n. c. fn: Naam: Pzrsns ca.. ulAsHmcr AUGUST .I BECI-ITOLD, JR., OFHAVRE DE GRACE, MARYLAND.

ATTAQHMENT FOR 'DRAWING-BOARDS.

Specification of Letters Patent.

Patented Dec. 15, 1908.

Application led July 31, 1907. Serial No. 386,364.

To (LU whom 'it may concern:

Be it known that I, AUGUST J. lnoirronn, Jr., a citizen of the UnitedStates,` residing at Havre de Grace, in the county of IIarford, State ofMaryland, have invented certain new and useful Improvements inAttachments for Drawing-Boards; and I do hereby declare the following tobe a full, clear, and exact description of the invention` such as willenableothers skilled. in the art lo which it appertains to make and usethe same.

This i vention relates to attachments for drawing boards and has for itsobject to pre- Vide an attachment which may be applied to any ordinarydrawing board and which when in place, will aid materially in laying outdimensions and plotting.

The device is desirable `in that it can be attached to and detached fromany drawing board without altering the board or materially defacing thesame.

In the accompanying drawings, Figure l is a plan view of a drawing boardshowing the attachment in place thereon, and, Fig. 2 is an edge View ofthe board and attachment.

The attachment is formed of sheet metal and comprises a pair of arms Gand 7 which extend at right-angles with respect to each other. Each ofthe arms has stamped there on a plurality of ribs 9 which are providedwith scale marks 9a. The scales upon these portions of each arm arepreferably of different chzu'actersl` and in actual practice I havefound it expedient to provide the inner portions of each arm with scalemarks ranging from one inch to one thirty-second of an inch, the nextadjacent portion with scale marks ranging from three sixteenths to onesixty-fourth of an inch, and the outer or next adjacent portion withmarks from one-fourth to one ninety-sixth of an inch. It will beapparent, of course, that any other system of marking may be employed,but I have found this to be the most desirable one.

.lt its extreme end and upon its inner edge. each of the arms (i and iprovided with an integral longue l0 which serves as a means 'whereby theattachment may be secured upon the drawing board. r1"'he attachment isapplied to the board in such a manner that its outer edges will beflushed with two adjacent edges of the board in order that said edgesmay be used to guide the T- square in the ordinary manner. The graduatedsurface of the ribs is above the surface of the drawing board, so thatwhen the drawing is being inked in, the T-square will be held spacedfrom the drawing, and consequently it will not be necessary to wait forone line to dry before drawing another line which would be covered bythe T-square.

IVhat is claimed, is-

lhe combination with a d rawing-board, of an angular plate secured tothe face of said board and extending along two adjacent edges thereof,flush with said edges, said plate having longitudinal ribs projectingabove the surface of the drawing-board, and provided with graduations.

In testimony whereof, I a'tlix my signature, in presence of twowitnesses.

AUGUST J. BECI-ITOLD, Jn. lVitnesses CHARLES Il. Bnoirronn, Samia It.,Bucirronn

